JP6627364B2 - Light source device, light source unit and projector - Google Patents

Description

  The present invention relates to a light source device, a light source unit, and a projector.

  2. Description of the Related Art In recent years, laser light sources that can obtain high-brightness and high-output light have been used in projectors. For example, Patent Document 1 below discloses a projector that uses fluorescent light generated by making a blue laser beam incident on a phosphor layer and diffused light of the blue laser beam.

JP 2013-250494 A

  By the way, in the above projector, for example, when the intensity of the blue laser light is increased in order to obtain a high light output, the temperature of the phosphor layer and the diffuser increases. At this time, if the cooling capacity of the phosphor layer or the diffusion plate is not sufficient, there is a possibility that the luminous efficiency of the phosphor layer is reduced or the diffusion plate is damaged by heat.

  The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a light source device, a light source unit, and a projector that can obtain a high light output while reducing a temperature rise.

According to a first aspect of the present invention, a light emitting device that emits first light and second light, and a first device that separates the first light into a first light beam and a second light beam A second light separating element that separates the second light into a third light beam and a fourth light beam, and a first fluorescent light emitting unit that receives the first light beam And at least one phosphor layer including a second fluorescent light emitting portion on which the third light beam is incident, a first diffused light emitting portion on which the second light beam is incident, and the fourth light beam. At least one diffusing portion including a second diffusing light emitting portion to be incident, a first lens integrator optical system, a second lens integrator optical system, light emitted from the first lens integrator optical system, and A superimposing lens into which light emitted from the second lens integrator optical system is incident When, with a, when viewed from the first direction perpendicular to the optical axis of said first main light beam and the superimposing lens of the light incident on the light splitting element, the optical axis, said first fluorescent emission And the second fluorescent emission section are located between the section and the second fluorescent emission section, and the first fluorescent emission section and the second fluorescent emission section respectively emit light in the same direction along the optical axis. A light source device is provided.

  According to the light source device according to the above aspect, it is possible to suppress the respective light amounts incident on the first fluorescent light emitting unit, the second fluorescent light emitting unit, the first diffused light emitting unit, and the second diffused light emitting unit. Thus, the temperature rise of the phosphor layer is reduced, so that the light source device can efficiently emit the fluorescent light. Therefore, a high light output can be obtained. In addition, it is possible to prevent a problem that the diffuser is damaged by excessively strong light entering the first diffused light emitter and the second diffused light emitter.

  In the present specification, the term “fluorescence emitting portion” refers to a region of the phosphor layer where excitation light is incident at a certain moment. As long as the optical path of the excitation light is fixed, even if the phosphor layer moves, the fluorescence emission unit does not move. Further, the diffused light emitting portion refers to a region in the diffused portion where light is incident at a certain moment. Similarly, the diffused light emitting unit does not move.

In the above aspect, a first homogenizer optical system provided on an optical path of the first light between the light emitting device and the first light separating element, the light emitting device and the second light separating element And a second homogenizer optical system provided on an optical path of the second light between the first light splitting element and the first fluorescent light emitting unit. A first condensing optical system provided on an optical path, and a second condensing optical system provided on an optical path of the third light beam between the second light separating element and the second fluorescence emitting section. A condensing optical system, a third condensing optical system provided on an optical path of the second light beam between the first light separating element and the first diffused light emitting unit, And a fourth condensing optical system provided on an optical path of the fourth light flux between the second light separating element and the second diffused light emitting unit. The optical path length between the first condensing optical system and the first homogenizer optical system is equal to the optical path length between the second condensing optical system and the second homogenizer optical system, The optical path length between the third condensing optical system and the first homogenizer optical system may be equal to the optical path length between the fourth condensing optical system and the second homogenizer optical system. Good.
According to this configuration, since the optical path lengths of the light incident on the first diffused light emission unit and the second diffused light emission unit are equal to each other, the light from the first diffused light emission unit and the second diffused light emission unit The brightness of the emitted diffused light can be made equal to each other. In addition, since the optical path lengths of the light incident on the first fluorescent light emitting section and the second fluorescent light emitting section are equal to each other, the brightness of the fluorescent light emitted from the first fluorescent light emitting section and the second fluorescent light emitting section is reduced. Can be equal to each other.

In the above aspect, the apparatus further includes a first lens integrator optical system and a second lens integrator optical system, wherein the first fluorescent light emitting unit emits third light toward the first light separating element, A second fluorescent light emitting unit that emits fourth light toward the second light separating element, a first diffused light emitting unit emits fifth light toward the first light separating element, A second diffused light emission unit that emits sixth light toward the second light separation element, wherein the third light and the fifth light are combined by the first light separation element; The fourth light and the sixth light are combined by the second light separation element, and the third light and the fifth light combined by the first light separation element are the third light and the fifth light. The fourth light that has entered the first lens integrator optical system and has been combined by the second light separation element. The sixth light is incident on the second lens integrator optical system, and a secondary light source image formed by the third light, a secondary light source image formed by the fourth light, The secondary light source image formed by the fifth light and the secondary light source image formed by the sixth light may be configured to form an image on the same plane.
According to this configuration, it is possible to employ a reflection type fluorescence emission unit and a diffused light emission unit. Further, for example, by combining one superimposing lens, the third light and the fifth light transmitted through the first lens integrator optical system and the fourth light transmitted through the second lens integrator optical system are combined. The light and the sixth light can be favorably overlapped with each other on the illuminated area.
Further, it is more desirable to further include a superimposing lens on which the light emitted from the first lens integrator optical system and the light emitted from the second lens integrator optical system enter.
According to this configuration, the illuminance on the illuminated area can be made uniform.

In the above aspect, the apparatus further comprises a first substrate rotatable around a first rotation axis and supporting the at least one phosphor layer, wherein the at least one phosphor layer includes the first substrate. A first phosphor layer provided around a rotation axis, and viewed from a direction perpendicular to a principal ray of the first light incident on the first light separating element and an optical axis of the superimposing lens. In this case, the optical axis may be located between the first fluorescent light emitting portion and the second fluorescent light emitting portion.
According to this configuration, the first fluorescent light emitting portion and the second fluorescent light emitting portion are separated from each other by a certain distance in the rotation direction of the first base material.
Thereby, the rise in temperature of the phosphor layer can be reduced.

In the above aspect, the distance between the first fluorescence emission unit and the first rotation axis is different from the distance between the second fluorescence emission unit and the first rotation axis. Is also good.
According to this configuration, the temperature rise of the phosphor layer can be further reduced.

In the above aspect, the apparatus further includes a second substrate rotatable around a second rotation axis and supporting the at least one diffusion unit, wherein the at least one diffusion unit includes the second rotation axis. Is constituted by one diffusion portion provided around, and when viewed from a direction perpendicular to the optical axis of the superimposing lens and the central optical axis of the light emitting device orthogonal to the optical axis, the central optical axis is The first and second diffused light emitting portions may be located between the first and second diffused light emitting portions.
According to this configuration, the first diffused light emitting portion and the second diffused light emitting portion are separated from each other by a certain distance in the rotation direction of the second base member.
Thereby, the temperature rise of the diffusion unit can be reduced.

In the above aspect, a distance between the first diffused light emission unit and the second rotation axis is different from a distance between the second diffused light emission unit and the second rotation axis. It may be configured.
According to this configuration, it is possible to further reduce the temperature rise of the diffusion unit.

In the above aspect, the first homogenizer optical system and the second homogenizer optical system may each be configured to include a pair of lens arrays.
According to this configuration, the first light and the second light can be made uniform with a simple configuration.

In the above aspect, the first condensing optical system and the second condensing optical system have the same configuration, and the third condensing optical system and the fourth condensing optical system have the same configuration. May be provided.
According to this configuration, it is possible to suppress the occurrence of a shift in the optical path length of the light incident on the first fluorescence emission unit and the second fluorescence emission unit. Further, it is possible to suppress the occurrence of a shift in the optical path length of the light incident on the first diffused light emission unit and the second diffused light emission unit.

In the above aspect, the first lens integrator optical system and the second lens integrator optical system may each be configured by a pair of lens arrays.
According to this configuration, the third light, the fourth light, the first diffused light, and the second diffused light can be made uniform with a simple configuration.

  According to a second aspect of the present invention, the light source apparatus includes a first light source device and a second light source device, and the first light source device and the second light source device are respectively configured from the light source device according to the first aspect. In addition, a light source unit including a single lens member is provided for the superimposing lens in the first light source device and the superimposing lens in the second light source device.

  According to the light source unit of the above aspect, by using one superimposing lens, the light generated by the first light source device and the light generated by the second light source device are superimposed on each other in the illuminated area. be able to.

  According to a second aspect of the present invention, the light source device according to the first aspect or the illumination device including the light source unit according to the second aspect, and light emitted from the illumination device is modulated according to image information. And a projection optical system that projects the image light.

  According to the projector according to the aspect, since the light source device or the light source unit is provided, a bright image can be displayed.

FIG. 1 is a schematic diagram illustrating an optical system of a projector according to a first embodiment. The figure which shows the schematic structure of a light source device. FIG. 6 is a diagram illustrating a schematic configuration of a light source device according to a second embodiment. The figure which shows the structure which looked at the rotating fluorescent screen from above. (A) is a side view of a rotating fluorescent plate according to a modification, and (b) is a plan view. The figure which shows the structure which looked at the rotating diffusion plate from above. (A) is a side view of a rotating diffuser plate according to a modification, and (b) is a plan view. The figure which shows the side surface structure of the light source unit which concerns on 3rd Embodiment. FIG. 4 is a plan view of a second light source device.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In addition, in the drawings used in the following description, in order to make the characteristics easy to understand, the characteristic portions may be enlarged for convenience, and the dimensional ratios and the like of the respective components are not necessarily the same as the actual ones. Absent.

(1st Embodiment)
An example of the projector according to the embodiment will be described. The projector according to the present embodiment is a projection-type image display device that displays a color image on a screen (projected surface). The projector includes three liquid crystal light modulators corresponding to red, green, and blue light. The projector is provided with a semiconductor laser capable of obtaining high-brightness and high-output light as a light source of the lighting device.

FIG. 1 is a schematic diagram illustrating an optical system of a projector according to the present embodiment.
As shown in FIG. 1, the projector 1 includes a light source device 2, a color separation optical system 3, a light modulator 4R, a light modulator 4G, a light modulator 4B, a combining optical system 5, and a projection optical system 6. , Is roughly provided.

  In the present embodiment, the light source device 2 emits white light W as illumination light toward the color separation optical system 3.

  The color separation optical system 3 is for separating the white light W into red light LR, green light LG, and blue light LB. The color separation optical system 3 includes a first dichroic mirror 7a and a second dichroic mirror 7b, a first total reflection mirror 8a, a second total reflection mirror 8b, a third total reflection mirror 8c, and a first A relay lens 9a and a second relay lens 9b are roughly provided.

  The first dichroic mirror 7a has a function of separating the white light W from the light source device 2 into a red light LR and other lights (green light LG and blue light LB). The first dichroic mirror 7a transmits the separated red light LR and reflects other lights (green light LG and blue light LB). On the other hand, the second dichroic mirror 7b has a function of separating other light into green light LG and blue light LB. The second dichroic mirror 7b reflects the separated green light LG and transmits the blue light LB.

The first total reflection mirror 8a is arranged in the optical path of the red light LR, and reflects the red light LR transmitted through the first dichroic mirror 7a toward the light modulator 4R. On the other hand, the second total reflection mirror 8b and the third total reflection mirror 8c are arranged in the optical path of the blue light LB, and guide the blue light LB transmitted through the second dichroic mirror 7b to the light modulator 4B.
The green light LG is reflected by the second dichroic mirror 7b toward the light modulator 4G.

  The first relay lens 9a and the second relay lens 9b are arranged below the second dichroic mirror 7b in the optical path of the blue light LB. The first relay lens 9a and the second relay lens 9b have a function of compensating for the optical loss of the blue light LB caused by the optical path length of the blue light LB being longer than the optical path length of the red light LR or the green light LG. Have.

  The light modulator 4R modulates the red light LR according to image information while passing the red light LR, and forms image light corresponding to the red light LR. The light modulator 4G modulates the green light LG according to image information while passing the green light LG, and forms image light corresponding to the green light LG. The light modulator 4B modulates the blue light LB according to image information while passing the blue light LB, and forms image light corresponding to the blue light LB.

  As the light modulator 4R, the light modulator 4G, and the light modulator 4B, for example, transmissive liquid crystal panels are used. Further, a pair of polarizing plates (not shown) are arranged on the incident side and the emission side of the liquid crystal panel, and are configured to pass only linearly polarized light in a specific direction.

  A field lens 10R, a field lens 10G, and a field lens 10B are arranged on the incident side of the light modulator 4R, the light modulator 4G, and the light modulator 4B, respectively. The field lens 10R, the field lens 10G, and the field lens 10B are used to collimate the red light LR, the green light LG, and the blue light LB incident on the respective light modulators 4R, 4G, and 4B. It is.

  The combining optical system 5 combines the image lights corresponding to the red light LR, the green light LG, and the blue light LB, and emits the combined image light toward the projection optical system 6. For the combining optical system 5, for example, a cross dichroic prism is used.

  The projection optical system 6 is composed of a projection lens group. The projection optical system 6 enlarges and projects the image light combined by the combining optical system 5 toward the screen SCR. As a result, an enlarged color image is displayed on the screen SCR.

(Light source device)
Next, the configuration of the light source device 2 will be described. Hereinafter, each configuration of the light source device will be described using an XYZ coordinate system as needed.
FIG. 2 is a diagram showing a schematic configuration of the light source device 2. In FIG. 2, the X direction is a direction parallel to the optical axes ax1 and ax2, the Y direction is a direction parallel to the optical axes ax3 and ax4 orthogonal to the optical axes ax1 and ax2, and the Z direction is the X direction and the X direction. These directions are orthogonal to the Y direction.

  The light source device 2 emits white light W as illumination light. The white light W is composed of illumination light WL and illumination light WL 'described later.

  The light source device 2 includes a light emitting device 11, a first homogenizer optical system 12, a first retardation plate 13a, a first light separating element 14, a first pickup optical system 15, a first fluorescent light emitting element 16, Third phase plate 13c, third pickup optical system 17, first diffusing element 18, second homogenizer optical system 19, second phase plate 13b, second light separating element 20, second pickup Optical system 21, second fluorescent light emitting element 22, fourth retardation plate 13d, fourth pickup optical system 23, second diffusing element 24, first lens integrator unit 25, second lens integrator unit 26, polarization A conversion element 27 and a superimposing lens 28 are provided.

  The light emitting device 11 has a first light emitting device 11A and a second light emitting device 11B.

  A first light emitting device 11A, a first homogenizer optical system 12, a first retardation plate 13a, a first light separating element 14, a third retardation plate 13c, and a third pickup optical system 17 And the first diffusion element 18 are sequentially arranged on the optical axis ax1. Also, the second light emitting device 11B, the second homogenizer optical system 19, the second retardation plate 13b, the second light separating element 20, the fourth retardation plate 13d, and the fourth pickup optical The system 23 and the second diffusing element 24 are sequentially arranged on the optical axis ax2.

The first fluorescent light emitting element 16, the first pickup optical system 15, the first light separating element 14, the first lens integrator unit 25, the polarization converting element 27, and the superimposing lens 28 have an optical axis ax3. It is arranged side by side on the top.
The second fluorescent light emitting element 22, the second pickup optical system 21, the second light separating element 20, the second lens integrator unit 26, the polarization converting element 27, and the superimposing lens 28 have an optical axis ax4 It is arranged side by side on the top.
Note that the optical axes ax1, ax2, ax3, and ax4 are on the same plane. The optical axis ax1 and the optical axis ax2 are parallel to each other, and the optical axis ax3 and the optical axis ax4 are parallel to each other. The optical axis ax1 is orthogonal to the optical axis ax3.

  The first light emitting device 11A includes a first light emitting unit 110 and a first collimating optical system 111.

  In the present embodiment, the first pickup optical system 15 corresponds to the “first light-collecting optical system” in the claims, and the second pickup optical system 21 corresponds to the “second light-collecting optical system” in the claims. The third pickup optical system 17 corresponds to the “third collection optical system” in the claims, and the fourth pickup optical system 23 corresponds to the “third collection optical system” in the claims. This corresponds to a “fourth light collecting optical system”.

  In the present embodiment, the optical path length L1 between the first pickup optical system 15 and the first homogenizer optical system 12 is the optical path length between the second pickup optical system 21 and the second homogenizer optical system 19. It is equal to L2. An optical path length L3 between the third pickup optical system 17 and the first homogenizer optical system 12 is equal to an optical path length L4 between the fourth pickup optical system 23 and the second homogenizer optical system 19. .

  The first light emitting unit 110 includes a plurality of semiconductor lasers 110a as solid state light sources. The plurality of semiconductor lasers 110a are arranged in an array on the same plane orthogonal to the optical axis ax1. The semiconductor laser 110a emits, for example, blue light BL1 (for example, laser light having a peak wavelength of 460 nm). In the present embodiment, the first light emitting unit 110 emits a light beam K1 including a plurality of blue lights BL1.

  The first collimating optical system 111 converts the light beam K1 emitted from the first light emitting unit 110 into a parallel light beam. The first collimating optical system 111 is composed of, for example, a plurality of collimator lenses 111a arranged in an array. Each of the plurality of collimator lenses 111a is arranged corresponding to the plurality of semiconductor lasers 110a.

  The light beam K1 collimated by the first collimating optical system 111 enters the first homogenizer optical system 12. The first homogenizer optical system 12 includes, for example, a first lens array 12a and a second lens array 12b. The first lens array 12a includes a plurality of first small lenses 12am, and the second lens array 12b includes a plurality of second small lenses 12bm. In the present embodiment, the first lens array 12a and the second lens array 12b correspond to "a pair of lens arrays" in the claims.

  The light beam K1 that has passed through the first homogenizer optical system 12 enters the first phase difference plate 13a. The first retardation plate 13a is, for example, a rotatable half-wave plate. The light beam K1 is linearly polarized light. Therefore, the light transmitted through the first retardation plate 13a becomes light containing the S-polarized light component and the P-polarized light component for the first light separating element 14 at a predetermined ratio. That is, by appropriately setting the rotation angle of the first retardation plate 13a, it is possible to set the ratio between the S-polarized light component and the P-polarized light component to a predetermined value.

  The first light splitting element 14 is composed of, for example, a dichroic mirror having wavelength selectivity. The first light separating element 14 is disposed so as to form an angle of 45 ° with the optical axis ax1 and the optical axis ax3. The first light separating element 14 reflects the S-polarized light component of the incident light (light flux K1) and transmits the P-polarized light component of the incident light. That is, the first light separating element 14 has a function of separating the light beam K1 that is the incident light into the S-polarized light component (light beam BLs) and the P-polarized light component (light beam BLp). In the present embodiment, the light beam K1 corresponds to the “first light” in the claims, the light beam BLs corresponds to the “first light beam” in the claims, and the light beam BLp corresponds to the claims. Corresponds to the “second light beam bundle”.

The light beam BLs of the S-polarized light component is reflected by the first light separating element 14 and travels to the first fluorescent light emitting element 16. The light beam BLp of the P-polarized light component passes through the first light separating element 14 and travels to the first diffusing element 18. The first light separation element 14 has a color separation function of transmitting fluorescent light YL, which will be described later, having a wavelength band different from that of the light beam K1 irrespective of its polarization state.
Based on such a configuration, the first light separating element 14 reflects the diffused blue light BL from the first diffuser 18 and transmits the fluorescent light YL from the first fluorescent light emitting element 16 as described later. Then, these are combined to generate white illumination light WL.

  The light beam BLs reflected by the first light separation element 14 enters the first pickup optical system 15. The first pickup optical system 15 has a function of condensing the light beam BLs toward the phosphor layer 16a of the first fluorescent light emitting element 16, and a function of picking up the fluorescent light YL emitted from the phosphor layer 16a. Having.

  Further, the first pickup optical system 15 cooperates with the first homogenizer optical system 12 to uniform the illuminance distribution by the light beam BLs on the phosphor layer 16a. The first pickup optical system 15 includes, for example, pickup lenses 15a and 15b.

  The light beam BLs emitted from the first pickup optical system 15 enters the first fluorescent light emitting element 16. In the present embodiment, the first fluorescent light emitting element 16 is arranged at the focal position of the first pickup optical system 15.

  The first fluorescent light emitting element 16 includes a substrate 16b and a phosphor layer 16a. The first fluorescent light emitting element 16 emits the fluorescent light YL toward the same side as the side on which the light beam BLs is incident. The substrate 16b is made of, for example, a metal disk having excellent heat dissipation such as aluminum or copper.

  In the present embodiment, the region of the phosphor layer 16a where the light beam BLs is incident corresponds to the "first fluorescent light emitting portion" in the claims, and the fluorescent light YL corresponds to the "first fluorescent light emitting portion" in the claims. Third light ".

  The phosphor layer 16a includes phosphor particles that absorb the light beam BLs, convert the light beam BLs into yellow fluorescent light YL, and emit the light. As the phosphor particles, for example, a YAG (yttrium aluminum garnet) phosphor can be used. The material for forming the phosphor particles may be one kind, or a mixture of particles formed using two or more kinds of materials may be used as the phosphor particles.

  It is preferable to use a material having excellent heat resistance and surface workability as the phosphor layer 16a. As such a phosphor layer 16a, for example, a phosphor layer in which phosphor particles are dispersed in an inorganic binder such as alumina, a phosphor layer in which phosphor particles are sintered without using a binder, or the like is preferably used. be able to.

  On the side of the phosphor layer 16a opposite to the side on which the light beam BLs is incident, a reflecting portion 16c is provided. The reflector 16c reflects the fluorescent light YL generated by the phosphor layer 16a.

  The fluorescent light YL emitted from the phosphor layer 16a is collimated by the first pickup optical system 15 and passes through the first light separating element 14.

  On the other hand, the light beam BLp emitted from the first light separating element 14 enters the third retardation plate 13c. The third retardation plate 13c is formed of a quarter-wave plate (λ / 4 plate). The light beam BLp is converted into a circularly polarized light beam BLc by transmitting through the third retardation plate 13c. The light beam BLc transmitted through the third retardation plate 13c enters the third pickup optical system 17.

  The third pickup optical system 17 has a function of condensing the light beam BLc toward the first diffusing element 18 and a function of picking up the diffused light emitted from the first diffusing element 18. The third pickup optical system 17 includes, for example, pickup lenses 17a and 17b.

  Further, the third pickup optical system 17 cooperates with the first homogenizer optical system 12 to make the illuminance distribution of the light beam BLc on the first diffusing element 18 uniform. In the present embodiment, the first diffusing element 18 is arranged at the focal position of the third pickup optical system 17.

  The first diffusing element 18 diffuses and reflects the light beam BLc emitted from the third pickup optical system 17 toward the first light separating element 14. Hereinafter, the light reflected by the first diffusion element 18 will be referred to as diffused blue light BL. In the present embodiment, the diffused blue light BL corresponds to “fifth light” in the claims.

  The first diffusion element 18 includes a diffusion reflection plate 18A and a driving device 18M such as a motor for rotating the diffusion reflection plate 18A. The diffuse reflection plate 18A is made of, for example, a member having light reflectivity. The diffuse reflector 18A has irregularities on its surface. In the present embodiment, the uneven surface of the diffuse reflection plate 18A corresponds to the “diffusion portion” in the claims, and the region of the diffusion reflection plate 18A where the light beam BLc enters is referred to as “the diffusion portion” in the claims. 1st diffused light emission section ".

  The rotation axis of the driving device 18M is arranged substantially parallel to the optical axis ax1. Thus, the diffuse reflector 18A is configured to be rotatable in a plane that intersects with the principal ray of the light beam BLc incident on the diffuse reflector 18A. The diffuse reflection plate 18A is formed, for example, in a circular shape when viewed from the direction of the rotation axis.

  The circularly-polarized diffused blue light BL reflected by the diffuse reflection plate 18A and transmitted through the third pickup optical system 17 again passes through the third retardation plate 13c again to become S-polarized light. The S-polarized diffused blue light BL enters the first light separating element 14 and is reflected.

  The first light splitting element 14 combines the fluorescent light YL transmitted through the first light splitting element 14 and the diffused blue light BL reflected by the first light splitting element 14 to generate white illumination light WL. Generate.

The second light emitting device 11B has the same configuration as the first light emitting device 11A, and includes a second light emitting unit 210 and a second collimating optical system 211.
The second light emitting unit 210 includes a plurality of semiconductor lasers 210a, and emits a light beam K2 including a plurality of blue lights BL2. The second collimating optical system 211 converts the light beam K2 emitted from the second light emitting unit 210 into a parallel light beam. The second collimating optical system 211 is composed of, for example, a plurality of collimator lenses 211a arranged in an array. Each of the plurality of collimator lenses 211a is arranged corresponding to the plurality of semiconductor lasers 210a.

  The light beam K2 collimated by the second collimating optical system 211 enters the second homogenizer optical system 19. The second homogenizer optical system 19 includes, for example, a first lens array 19a and a second lens array 19b. The first lens array 19a includes a plurality of first small lenses 19am, and the second lens array 19b includes a plurality of second small lenses 19bm. In the present embodiment, the first lens array 19a and the second lens array 19b correspond to "a pair of lens arrays" in the claims.

  The light beam K2 that has passed through the second homogenizer optical system 19 enters the second retardation plate 13b. The second retardation plate 13b has the same configuration as the first retardation plate 13a. Therefore, by appropriately setting the rotation angle of the second phase difference plate 13b, it is possible to set the ratio between the S-polarized light component and the P-polarized light component with respect to the second light separating element 20.

  The second light separating element 20, like the first light separating element 14, is composed of, for example, a dichroic mirror having wavelength selectivity. The second light separating element 20 is arranged so as to form an angle of 45 ° with the optical axis ax2 and the optical axis ax4. The second light separating element 20 and the first light separating element 14 are arranged on the same plane.

  The second light separating element 20 reflects an S-polarized component of the incident light (light beam K2) and transmits a P-polarized component of the incident light. That is, the second light separating element 20 has a function of separating the light beam K2, which is the incident light, into S-polarized light component (light beam BLs ') and P-polarized light component (light beam BLp'). In the present embodiment, the light beam K2 corresponds to the "second light" in the claims, the light beam BLs 'corresponds to the "third light beam" in the claims, and the light beam BLs' This corresponds to the “fourth ray bundle” in the claims. In this specification, the light beam BLs and the light beam BLs' may be collectively referred to as excitation light.

The light beam BLs ′ of the S-polarized light component is reflected by the second light separating element 20 and travels to the second fluorescent light emitting element 22. The light beam BLp ′ of the P-polarized light component passes through the second light separating element 20 and travels to the second diffusing element 24. The second light separating element 20 has a color separating function of transmitting the fluorescent light YL ′ having a wavelength band different from that of the light beam K2 regardless of its polarization state.
Based on such a configuration, the second light separating element 20 reflects the diffused blue light BL ′ from the second diffuser 24 and the fluorescent light YL ′ from the second fluorescent light emitting element 22 as described later. Are transmitted to generate white illumination light WL ′.

The light beam BLs ′ reflected by the second light separating element 20 enters the second pickup optical system 21. The second pickup optical system 21 has the same configuration as the first pickup optical system 15. Accordingly, it is easy to set the optical path length of the light beam BLs incident on the first fluorescent light emitting element 16 equal to the optical path length of the light beam BLs ′ incident on the second fluorescent light emitting element 22.
The second pickup optical system 21 includes, for example, pickup lenses 21a and 21b, has a function of condensing the light beam BLs 'toward the phosphor layer 22a of the second fluorescent light emitting element 22, and emits the light beam BLs' from the phosphor layer 22a. And picks up the extracted fluorescent light YL ′.

  The second pickup optical system 21 cooperates with the second homogenizer optical system 19 to uniform the illuminance distribution of the light beam BLs' on the phosphor layer 22a.

  The light beam BLs' emitted from the second pickup optical system 21 enters the second fluorescent light emitting element 22. In the present embodiment, the second fluorescent light emitting element 22 is disposed at the focal position of the second pickup optical system 21.

The second fluorescent light emitting element 22 includes a substrate 22b and a phosphor layer 22a which absorbs the light beam BLs', converts the light beam BLs' into yellow fluorescent light YL ', and emits the light. On the opposite side of the phosphor layer 22a from the side on which the light beam BLs' is incident, a reflecting portion 26c is provided.
Thereby, the second fluorescent light emitting element 22 emits the fluorescent light YL ′ toward the same side as the side where the light beam BLs ′ is incident. The substrate 22b is made of, for example, a metal disk having excellent heat dissipation such as aluminum or copper. In the present embodiment, the region of the phosphor layer 22a where the light beam BLs 'is incident corresponds to the "second fluorescent light emitting portion" in the claims, and the fluorescent light YL' is defined in the claims. Corresponds to the “fourth light”.

  The fluorescent light YL 'emitted from the phosphor layer 22a is collimated by the second pickup optical system 21 and passes through the second light separating element 20.

  On the other hand, the light beam BLp 'emitted from the second light separating element 20 enters the fourth retardation plate 13d. The fourth retardation plate 13d is composed of a 波長 wavelength plate (λ / 4 plate). The light beam BLp 'is converted into a circularly polarized light beam BLc' by transmitting through the fourth retardation plate 13d. The light beam BLc ′ transmitted through the fourth retardation plate 13 d enters the fourth pickup optical system 23.

  The fourth pickup optical system 23 has a function of condensing the light beam BLc ′ toward the second diffusion element 24 and a function of picking up diffused light emitted from the second diffusion element 24. The fourth pickup optical system 23 has the same configuration as the third pickup optical system 17. The fourth pickup optical system 23 includes, for example, pickup lenses 23a and 23b. Accordingly, it is easy to set the optical path length of the light beam BLp incident on the first diffusing element 18 to be equal to the optical path length of the light beam BLp ′ incident on the second diffusing element 24.

  In addition, the fourth pickup optical system 23 cooperates with the second homogenizer optical system 19 to make the illuminance distribution by the light beam BLc 'on the second diffusing element 24 uniform. In the present embodiment, the second diffusing element 24 is disposed at the focal position of the fourth pickup optical system 23.

  The second diffusing element 24 diffuses and reflects the light beam BLc ′ emitted from the fourth pickup optical system 23 toward the second light separating element 20. Hereinafter, the light reflected by the second diffusion element 24 is referred to as diffused blue light BL '. In the present embodiment, the diffused blue light BL 'corresponds to "sixth light" in the claims.

  The second diffusion element 24 includes a diffusion reflection plate 24A and a driving device 24M such as a motor for rotating the diffusion reflection plate 24A. The diffuse reflection plate 24A is made of, for example, a member having light reflectivity. The diffuse reflection plate 24A has irregularities on its surface. In the present embodiment, the uneven surface of the diffuse reflection plate 24A corresponds to the “diffusion portion” in the claims, and the region of the diffuse reflection plate 24A where the light beam BLc ′ is incident is defined in the claims. This corresponds to a “second diffused light emitting section”.

  The rotation axis of the driving device 24M is disposed substantially parallel to the optical axis ax2. Thus, the diffuse reflector 24A is configured to be rotatable in a plane that intersects with the principal ray of the light beam BLc 'incident on the diffuse reflector 24A. The diffuse reflection plate 24A is formed, for example, in a circular shape when viewed from the direction of the rotation axis.

  The circularly-polarized diffused blue light BL ′ reflected by the diffuse reflection plate 24A and transmitted through the fourth pickup optical system 23 again passes through the fourth phase difference plate 13d and becomes S-polarized light. The S-polarized diffused blue light BL ′ is incident on the second light separating element 20 and is reflected.

  The second light separating element 20 combines the fluorescent light YL ′ transmitted through the second light separating element 20 and the diffused blue light BL ′ reflected by the second light separating element 20 to produce white illumination light. WL ′ is generated.

  The white illumination light WL synthesized by the first light separation element 14 enters the first lens integrator unit 25. The first lens integrator unit 25 includes, for example, a first lens array 25a and a second lens array 25b. The first lens array 25a includes a plurality of first small lenses 25am, and the second lens array 25b includes a plurality of second small lenses 25bm. In the present embodiment, the first lens array 25a and the second lens array 25b correspond to "a pair of lens arrays" in the claims.

  The first lens array 25a separates the illumination light WL into a plurality of small light beams. The first small lens 25am focuses the small light beam on the corresponding second small lens 25bm. The image formed on the second small lens 25bm is derived from the diffused blue light BL and the fluorescent light YL. That is, the secondary light source image of the diffused blue light BL and the secondary light source image of the fluorescent light YL are formed on the second lens array 25b.

  The illumination light WL that has passed through the first lens integrator unit 25 enters the polarization conversion element 27. The polarization conversion element 27 includes, for example, a polarization separation film and a phase difference plate, and converts the illumination light WL into linearly polarized light.

  The illumination light WL that has passed through the polarization conversion element 27 enters the superimposing lens 28. The illumination light WL emitted from the superimposing lens 28 enters the color separation optical system 3. The superimposing lens 28 superimposes the plurality of small ray bundles constituting the illumination light WL in the illuminated area.

On the other hand, the white illumination light WL ′ synthesized by the second light separating element 20 enters the second lens integrator unit 26. The second lens integrator unit 26 has the same configuration as the first lens integrator unit 25, and includes, for example, a first lens array 26a and a second lens array 26b.
That is, the first lens array 26a has the same configuration as the first lens array 25a of the first lens integrator unit 25, and the second lens array 26b has the same configuration as the second lens array 25b of the first lens integrator unit 25. It has the same configuration as.
In the present embodiment, the case where the second lens integrator unit 26 is formed separately from the first lens integrator unit 25 has been described as an example, but the second lens integrator unit 26 may be formed integrally.

  The first lens array 26a includes a plurality of first small lenses 26am, and the second lens array 26b includes a plurality of second small lenses 26bm. In the present embodiment, the first lens array 26a and the second lens array 26b correspond to "a pair of lens arrays" in the claims.

  The second lens array 26b separates the illumination light WL 'into a plurality of small light beams. The first small lens 26am focuses the small light beam on the corresponding second small lens 26bm. The image formed on the second small lens 26bm is derived from the diffused blue light BL 'and the fluorescent light YL'. That is, the secondary light source image of the diffused blue light BL 'and the secondary light source image of the fluorescent light YL' are formed on the second lens array 26b.

  In the present embodiment, the first lens integrator unit 25 and the second lens integrator unit 26 are arranged at the same position in a direction (Y direction) parallel to the optical axes ax3 and ax4. That is, since the second lens array 25b and the second lens array 26b are arranged at the same position in the Y direction, in this embodiment, the secondary light source image of the illumination light WL ′ and the secondary light source of the illumination light WL are used. The light source image is formed on the same plane (a plane parallel to the XZ plane) orthogonal to the optical axes ax3 and ax4.

  The illumination light WL ′ that has passed through the second lens integrator unit 26 enters the polarization conversion element 27 and is converted into linearly polarized light. The illumination light WL ′ that has passed through the polarization conversion element 27 enters the color separation optical system 3 via the superimposing lens 28. The superimposing lens 28 superimposes the plurality of light beam bundles constituting the illumination light WL 'on the illuminated area.

  In the present embodiment, the first lens integrator unit 25 and the second lens integrator unit 26 cooperate with the superimposing lens 28 to make the illuminance distribution in the illuminated area uniform.

In the present embodiment, white light W is generated by mixing blue light and yellow light. The blue light includes a diffused blue light BL generated by the first diffuser 18 and a diffused blue light BL ′ generated by the second diffuser 24. The yellow light is composed of the fluorescent light YL generated by the first fluorescent light emitting element 16 and the fluorescent light YL ′ generated by the second fluorescent light emitting element 22. In other words, the white light W is composed of the illumination light WL and the illumination light WL '.
Therefore, compared to the case where only one of the illumination light WL or the illumination light WL ′ constitutes the white light W, the first fluorescent light emitting element 16, the first diffusion element 18, the second fluorescent light emitting element 22, and the second fluorescent light emitting element Of light incident on the diffusing element 24 can be suppressed.
Therefore, an increase in the temperature of the phosphor layer 16a or the phosphor layer 22a can be reduced, and a decrease in the luminous efficiency of the phosphor due to a phenomenon called temperature quenching can be reduced. Therefore, the light source device 2 can emit the fluorescent light YL, YL 'with a high output because the temperature rise of the phosphor layer 16a or the phosphor layer 22a is reduced.

  Further, it is possible to prevent a problem that the diffuse reflector 18A or the diffuse reflector 24A is damaged by excessively strong light incident on the first diffuser 18 or the second diffuser 24.

  As described above, the optical path length L1 between the first pickup optical system 15 and the first homogenizer optical system 12 is equal to the optical path length between the second pickup optical system 21 and the second homogenizer optical system 19. Since it is equal to L2, the amount of light incident on the phosphor layer 22a of the second fluorescent light emitting element 22 is substantially equal to the amount of light incident on the fluorescent layer 16a of the first fluorescent light emitting element 16. That is, the brightness of the fluorescent light YL 'emitted from the phosphor layer 22a is substantially equal to the brightness of the fluorescent light YL emitted from the phosphor layer 16a.

  An optical path length L3 between the third pickup optical system 17 and the first homogenizer optical system 12 is equal to an optical path length L4 between the fourth pickup optical system 23 and the second homogenizer optical system 19. Therefore, the amount of light incident on the diffuse reflection plate 24A of the second diffusion element 24 is substantially equal to the amount of light incident on the diffusion reflection plate 18A of the first diffusion element 18. That is, the brightness of the diffused blue light BL 'emitted from the diffuse reflection plate 24A is substantially equal to the brightness of the diffused blue light BL emitted from the diffuse reflection plate 18A.

  Therefore, the illumination light WL has substantially the same brightness unevenness and substantially the same color unevenness as the illumination light WL '. Therefore, it is easy to reduce illumination unevenness in the illuminated area.

  As described above, the secondary light source image of the illumination light WL 'and the secondary light source image of the illumination light WL are formed on the same plane. In this case, by using a common superimposing lens 28 for the first lens integrator unit 25 and the second lens integrator unit 26, the illumination light WL ′ and the illumination light WL can be favorably superimposed on the illuminated area. it can.

  Therefore, the projector 1 of the present embodiment can display a bright image with reduced color unevenness on the screen SCR.

(2nd Embodiment)
Next, a projector according to a second embodiment will be described. The difference between this embodiment and the above embodiment is the configuration of the light source device. Therefore, the configuration of the light source device will be mainly described below. Note that the same reference numerals are given to members and configurations common to the above-described embodiment, and the description thereof will be omitted or simplified.

FIG. 3 is a diagram showing a schematic configuration of the light source device of the present embodiment.
As shown in FIG. 3, the light source device 2A of the present embodiment includes a light emitting device 11, a first homogenizer optical system 12, a first retardation plate 13a, a first light separation element 14, a first pickup optical system. 15, rotating fluorescent plate 100, third retardation plate 13c, third pickup optical system 17, rotating diffusion plate 120, second homogenizer optical system 19, second retardation plate 13b, second light separating element 20 , A second pickup optical system 21, a fourth retardation plate 13d, a fourth pickup optical system 23, a first lens integrator unit 25, a second lens integrator unit 26, a polarization conversion element 27, and a superposition lens 28. I have.

  The rotating fluorescent plate 100 includes a rotating substrate 101, a driving device 102 for driving the rotating substrate 101 to rotate, a phosphor layer 100A provided on the rotating substrate 101, a first fluorescent emission unit A1, and a second fluorescent emission unit A1. A section A2. The rotating fluorescent plate 100 emits the fluorescent light YL toward the same side as the light incident side.

  The rotating substrate 101 is made of, for example, a metal disk having excellent heat dissipation, such as aluminum or copper, and is rotatable around a predetermined rotation axis O1. The driving device 102 includes, for example, a motor or the like, and rotates the rotating substrate 101 around the rotation axis O1. In the present embodiment, the rotating substrate 101 corresponds to a “first substrate” in the claims, and the rotation axis O1 corresponds to a “first rotation axis” in the claims.

  In the present embodiment, the phosphor layer 100A is formed on the upper surface 101a of the rotating substrate 101 in a ring shape around the rotation axis O1. The reflecting portion 103 is provided on the opposite side of the phosphor layer 100A from the side on which the light beam BLs is incident.

  The phosphor layer 100A is arranged so as to face the first pickup optical system 15 and the second pickup optical system 21.

  The first fluorescent light emitting unit A1 converts the light beam BLs and emits it as fluorescent light YL, and the second fluorescent light emitting unit A2 converts the light beam BLs 'and emits it as fluorescent light YL'.

  The rotating diffusion plate 120 includes a diffusion reflection plate 121, a driving device 122 that rotationally drives the diffusion reflection plate 121, a first diffused light emission unit B1, and a second diffused light emission unit B2. The rotating diffusion plate 120 emits the diffused light toward the same side as the side on which the light is incident.

  The diffuse reflection plate 121 is made of, for example, a member having light reflectivity, and has irregularities on its surface. The diffuse reflection plate 121 is rotatable around a predetermined rotation axis O2. The driving device 122 includes, for example, a motor or the like, and rotates the diffuse reflection plate 121 around the rotation axis O2. In the present embodiment, the diffuse reflection plate 121 corresponds to the “second base material” in the claims, and the surface of the diffuse reflection plate 121 having irregularities corresponds to the “diffusion portion” in the claims. The rotation axis O2 corresponds to the "second rotation axis" in the claims.

  The diffuse reflection plate 121 is disposed so as to face the third pickup optical system 17 and the fourth pickup optical system 23. A region of the diffuse reflector 121 where the light beam BLp is incident at a certain moment is referred to as a first diffused light emitting unit B1, and a region of the diffuse reflector 121 where the light beam BLp 'is incident at a certain moment. This is referred to as a second diffused light emission section B2. The diffuse reflection plate 121 rotates, but the first diffused light emission unit B1 and the second diffused light emission unit B2 do not move.

The circularly-polarized diffused blue light BL reflected by the first diffused light emitting unit B1 and transmitted through the third pickup optical system 17 again passes through the third retardation plate 13c and becomes S-polarized light. The S-polarized diffused blue light BL enters the first light separating element 14 and is reflected.
The circularly-polarized diffused blue light BL ′ reflected by the second diffused light emitting unit B2 and transmitted through the fourth pickup optical system 23 again passes through the third retardation plate 13c to become S-polarized light. The S-polarized diffused blue light BL ′ is incident on the second light separating element 20 and is reflected.

  As shown in FIG. 3, in the X direction, the optical axis 28a of the superimposing lens 28 is located between the first fluorescent light emitting part A1 and the second fluorescent light emitting part A2. Specifically, when viewed from a direction (Z direction in FIG. 3) perpendicular to the principal ray of the light beam BLp incident on the first light separating element 14 and the optical axis 28a of the superimposing lens 28, the optical axis 28a is the first axis. Is located between the fluorescent light emitting part A1 and the second fluorescent light emitting part A2.

FIG. 4 is a diagram showing a configuration of the rotating fluorescent plate 100 in a plan view.
In the present embodiment, the first fluorescent light emitting portion A1 indicates a region of the phosphor layer 100A where the light beam BLs is incident at a certain moment. The second fluorescence emission part A2 indicates a region of the phosphor layer 100A where the light beam BLs' is incident at a certain moment. The rotating fluorescent plate 100 rotates, but the first fluorescent light emitting part A1 and the second fluorescent light emitting part A2 do not move.

  First, a case is considered where the distance between the first fluorescence emitting unit A1 and the rotation axis O1 is equal to the distance between the second fluorescence emission unit A2 and the rotation axis O1. The second fluorescence emission part A2 is located at a position where the first fluorescence emission part A1 is rotated by 180 ° around the rotation axis O1. Therefore, the first fluorescent light emitting portion A1 and the second fluorescent light emitting portion A2 are in a state where they are most separated from each other in the circumferential direction of the phosphor layer 100A.

  The phosphor irradiated with the excitation light (light beam BLs) in the first fluorescence emission unit A1 moves in the circumferential direction of the rotating substrate 101 with the rotation of the rotation substrate 101, and is excited in the second fluorescence emission unit A2. Light (light beam BLs') is emitted. Similarly, the phosphor irradiated with the excitation light (light beam BLs') in the second fluorescence emitting unit A2 moves in the circumferential direction of the rotating substrate 101 with the rotation of the rotating substrate 101, and emits the first fluorescent light. Excitation light (light flux BLs) is applied to the part A1. That is, the phosphor at a specific position of the phosphor layer 100A is irradiated with the excitation light every time the rotating substrate 101 rotates 180 °.

  However, in the present embodiment, since the second fluorescent light emitting portion A2 is at a position where the first fluorescent light emitting portion A1 is rotated by 180 ° around the rotation axis O1, the fluorescent light at a specific position of the phosphor layer 100A is provided. Excitation light is prevented from entering the body at short intervals. Therefore, the temperature rise of the phosphor layer 100A can be reduced.

  Note that the relationship between the position of the first fluorescent light emitting portion A1 and the position of the second fluorescent light emitting portion A2 is not limited to the above-described relationship. Even if the second fluorescent light emitting part A2 is at a position where the first fluorescent light emitting part A1 is rotated around the rotation axis O1 by an angle of 90 ° or more and 180 ° or less (a range indicated by reference numeral C1 in FIG. 4). Good.

  FIG. 5A is a side view illustrating a configuration of a main part of a rotating fluorescent plate 100 according to a modification, and FIG. 5B is a plan view illustrating a main configuration of the rotating fluorescent plate 100.

As shown in FIG. 5A, even when the distance D1 between the first fluorescent emission unit A1 and the rotation axis O1 is different from the distance D2 between the second fluorescence emission unit A2 and the rotation axis O1. good.
According to this configuration, the phosphor located at a specific position of the phosphor layer 100A is irradiated with the excitation light every time the rotating substrate 101 makes one rotation, so that the phosphor located at the specific position of the phosphor layer 100A is irradiated. Is irradiated with the excitation light longer than when the distance D1 is equal to the distance D2. Therefore, the temperature rise of the phosphor layer 100A can be further reduced.

Here, in FIG. 3, the central optical axis of the light emitting device 11 is an optical axis ax12. The optical axis ax12 passes through the center between the optical axis ax1 of the first light emitting device 11A and the optical axis ax2 of the second light emitting device 11B.
As shown in FIG. 3, in the Y direction, the optical axis ax12 is located between the first diffused light emission part B1 and the second diffused light emission part B2. Specifically, when viewed from the optical axis 28a of the superimposing lens 28 and the direction perpendicular to the optical axis ax12 of the light emitting device 11 perpendicular to the optical axis 28a (the Z direction in FIG. 3), the optical axis ax12 is the first diffusion axis. It is located between the light emitting part B1 and the second diffused light emitting part B2. In the present embodiment, the optical axis ax12 coincides with the rotation axis O2 of the rotating diffusion plate 120.

FIG. 6 is a diagram illustrating a configuration of the rotating diffusion plate 120 as viewed in plan.
First, consider the case where the distance between the first diffused light emission unit B1 and the rotation axis O2 is equal to the distance between the second diffused light emission unit B2 and the rotation axis O2. The second diffused light emitting portion B2 is at a position where the first diffused light emitting portion B1 is rotated by 180 ° around the rotation axis O2. Therefore, the first diffused light emitting portion B1 and the second diffused light emitting portion B2 are in a state where they are most separated from each other in the circumferential direction of the diffuse reflection plate 121.

  The diffusion unit irradiated with the light beam BLp in the first diffused light emission unit B1 moves in the circumferential direction of the diffused reflection plate 121 with the rotation of the diffused reflection plate 121, and the light beam in the second diffused light emission unit B2. The bundle BLp ′ is irradiated. Similarly, the diffusing unit irradiated with the light beam BLp ′ in the second diffused light emitting unit B2 moves in the circumferential direction of the diffused reflector 121 with the rotation of the diffused reflector 121, and emits the first diffused light. The light beam BLp is irradiated at the portion B1. That is, the light beam BLp or the light beam BLp 'is irradiated to the diffusion portion at a specific position of the diffuse reflection plate 121 every time the diffusion reflection plate 121 rotates 180 °.

  However, in the present embodiment, the second diffused light emitting portion B2 is located at a position obtained by rotating the first diffused light emitting portion B1 by 180 ° around the rotation axis O2, Light is prevented from entering a certain diffusion part at a short interval. Therefore, a rise in the temperature of the diffuse reflection plate 121 can be reduced.

  Note that the relationship between the position of the first diffused light emission unit B1 and the position of the second diffused light emission unit B2 is not limited to the above-described relationship. The second diffused light emitting unit B2 is located at a position (a range indicated by reference numeral C2 shown in FIG. 6) in which the first diffused light emitting unit B1 is rotated around the rotation axis O2 by an angle of 90 ° or more and 180 ° or less. You may.

  FIG. 7A is a side view illustrating a configuration of a main part of a rotary diffusion plate 120 according to a modification, and FIG. 7B is a plan view illustrating a main configuration of the rotary diffusion plate 120.

As shown in FIG. 7A, a configuration is such that a distance D3 between the first diffused light emission unit B1 and the rotation axis O2 is different from a distance D4 between the second diffused light emission unit B2 and the rotation axis O2. It is good.
According to this configuration, for example, the light beam BLp is irradiated to the diffusion portion at a specific position of the diffuse reflection plate 121 every time the diffusion reflection plate 121 makes one rotation. Is longer than when the distance D3 is equal to the distance D4. Therefore, the temperature rise of the diffuse reflection plate 121 can be further reduced.

  According to the present embodiment, the rotating fluorescent plate 100 including the first fluorescent light emitting portion A1 and the second fluorescent light emitting portion A2, and the first diffused light emitting portion B1 and the second diffused light emitting portion B2 are provided. The provision of the rotating diffusion plate 120 makes it possible to reduce the size of the device as compared with the first embodiment.

(Third embodiment)
Next, a projector according to a third embodiment will be described. The difference between this embodiment and the above embodiment is that a light source unit is provided instead of the light source device. Therefore, the configuration of the light source unit will be mainly described below. Note that the same reference numerals are given to members and configurations common to the above-described embodiment, and the description thereof will be omitted or simplified.

  FIG. 8 is a diagram illustrating a side configuration of the light source unit 80. As shown in FIG. 8, the light source unit 80 includes a first light source device 81 and a second light source device 82, and has a structure in which the first light source device 81 and the second light source device 82 are stacked. I have. For example, the first light source device 81 is disposed vertically above the second light source device 82. In FIG. 8, each of the components of the first light source device 81 and the second light source device 82 is shown in a partially simplified state.

  In the present embodiment, the first light source device 81 and the second light source device 82 are each configured by, for example, the light source device 2 of the first embodiment. Note that the first light source device 81 and the second light source device 82 may each be configured from the light source device 2A of the second embodiment.

  Note that the illumination light WL and the illumination light WL ′ generated by the first light source device 81 and the illumination light WL and the illumination light WL ′ generated by the second light source device 82 need to overlap each other in the illuminated area. There is. Therefore, in the present embodiment, the two superimposed lenses 28 are replaced with one superimposed lens 128.

  FIG. 9 is a diagram showing a planar configuration of the second light source device 82. As shown in FIG. 9, the components of the second light source device 82 are arranged such that the light emitting device 11 emits the light beam K1 and the light beam K2 in the −X direction. On the other hand, in the first light source device 81, as shown in FIG. 2, each component of the first light source device 81 is configured such that the light emitting device 11 emits the light beam K1 and the light beam K2 in the + X direction. Are located. That is, the layout of each component of the first light source device 81 and the layout of each component of the second light source device 82 are line-symmetric with respect to the optical axis 128 a of the superimposing lens 128.

  According to this configuration, when the light source unit 80 is viewed in a plan view (when viewed from the + Z direction), the light emitting devices 11 in the first light source device 81 and the second light source device 82 do not overlap. Also, the first light separating elements 14 do not overlap each other. The second light separating elements 20 do not overlap with each other. The diffuse reflection plates 18A do not overlap. The second diffusion elements 24 do not overlap. Therefore, the first light source device 81 and the second light source device 82 can be arranged close to each other in the Z direction so that the light source unit 80 can be downsized.

Although an embodiment of the present invention has been described by way of example, the present invention is not necessarily limited to the above embodiment, and various changes can be made without departing from the spirit of the present invention. It is.
For example, in the first embodiment, the reflection type is exemplified as the first fluorescence element 16 and the second fluorescence element 22 and the first diffusion element 18 and the second diffusion element 24. A transmission type may be used. Similarly, in the second embodiment, the rotary fluorescent screen 100 and the rotary diffuser 120 have been described as reflection-type ones, but transmission-type ones may be used.

  In the above-described embodiment, the projector 1 including the three light modulation devices 4R, 4G, and 4B has been described as an example. However, the invention can be applied to a projector that displays a color image with one light modulation device. Further, the light modulation device is not limited to the above-described liquid crystal panel, but may be, for example, a digital mirror device.

DESCRIPTION OF SYMBOLS 1 ... Projector, 2, 2A ... Light source device, 4R, 4G, 4B ... Light modulation device, 6 ... Projection optical system, 11 ... Light emitting device, 12 ... Second homogenizer optical system, 12a ... First lens array, 12b ... second lens array, 14 ... first light separating element, 15 ... first pickup optical system, 16 ... first fluorescent light emitting element, 16a ... phosphor layer, 17 ... third pickup optical system, 18 .. A first diffusing element, 19 a second homogenizer optical system, 19a a first lens array, 19b a second lens array, 20 a second light separating element, 21 a second pickup optical system, 22: second fluorescent light emitting element, 22a: phosphor layer, 23: fourth pickup optical system, 24: second diffusing element, 25: first integrator unit, 25a: first lens array, 25b: second 2 Lens array, 26: second integrator unit, 26a: first lens array, 26b: second lens array, 28, 28A, 28B: superimposed lens, 28a: optical axis, 80: light source unit, 81: first Light source device, 82 second light source device, 101 rotating substrate, 121 diffuse reflection plate, 128 lens member, A1 first fluorescent emission unit, A2 second fluorescent emission unit, B1 first Diffusion light emission part, B2 ... second diffusion light emission part.

Claims (12)

A light emitting device that emits first light and second light,
A first light separating element that separates the first light into a first light beam and a second light beam;
A second light separating element that separates the second light into a third light beam and a fourth light beam;
At least one phosphor layer including a first fluorescent light emitting portion on which the first light beam is incident and a second fluorescent light emitting portion on which the third light beam is incident;
At least one diffusing unit including a first diffused light emitting unit to which the second light beam enters and a second diffused light emitting unit to which the fourth light beam enters;
A first lens integrator optical system and a second lens integrator optical system,
A superimposed lens on which light emitted from the first lens integrator optical system and light emitted from the second lens integrator optical system enter ;
When viewed from a direction perpendicular to the principal ray of the first light incident on the first light separating element and the optical axis of the superimposing lens, the optical axis is defined by the first fluorescent light emitting portion and the second fluorescent light emitting portion. Is located between the fluorescent emission part of
It said first fluorescent emission portion and the second fluorescent emitting portion, the light source device you respectively emitted light toward the same direction along the optical axis. A first homogenizer optical system provided on an optical path of the first light between the light emitting device and the first light separating element;
A second homogenizer optical system provided on an optical path of the second light between the light emitting device and the second light separating element;
A first condensing optical system provided on an optical path of the first light flux between the first light separating element and the first fluorescence emitting unit;
A second condensing optical system provided on an optical path of the third light beam between the second light separating element and the second fluorescence emitting unit;
A third condensing optical system provided on an optical path of the second light flux between the first light separating element and the first diffused light emitting unit;
A fourth condensing optical system provided on an optical path of the fourth light flux between the second light separation element and the second diffused light emitting unit,
The optical path length between the first condensing optical system and the first homogenizer optical system is equal to the optical path length between the second condensing optical system and the second homogenizer optical system,
The optical path length between the third condensing optical system and the first homogenizer optical system is equal to the optical path length between the fourth condensing optical system and the second homogenizer optical system. 2. The light source device according to 1. A first fluorescence emission unit that emits third light toward the first light separation element;
A second fluorescence emission unit that emits fourth light toward the second light separation element;
A first diffused light emission unit that emits fifth light toward the first light separation element;
The second diffused light emission unit emits sixth light toward the second light separation element,
The third light and the fifth light are combined by the first light separation element,
The fourth light and the sixth light are combined by the second light separating element,
The third light and the fifth light combined by the first light separation element enter the first lens integrator optical system,
The fourth light and the sixth light combined by the second light separating element enter the second lens integrator optical system,
A secondary light source image formed by the third light, a secondary light source image formed by the fourth light, a secondary light source image formed by the fifth light, and the sixth light 3. The light source device according to claim 1, wherein the secondary light source image formed by the imaging is formed on the same plane. A first substrate rotatable about a first axis of rotation and supporting the at least one phosphor layer;
It said at least one phosphor layer, the light source device according to any one of the first of claims 1, which consists of one phosphor layer provided around the rotary shaft 3. The distance between the first fluorescent emitting portion and the first axis of rotation, according to claim 4 which is different from the distance between the first rotation shaft and the second fluorescent emitting portion Light source device. A second substrate rotatable about a second axis of rotation and supporting the at least one diffuser;
The at least one diffusion unit is configured by one diffusion unit provided around the second rotation axis,
When viewed from a direction perpendicular to an optical axis of the superimposing lens and a central optical axis of the light emitting device orthogonal to the optical axis, the central optical axis is defined by the first diffused light emitting unit and the second diffused light. The light source device according to any one of claims 1 to 5 , wherein the light source device is located between the light emitting unit and the light emitting unit. The distance between the first diffused light emitting portion and the second rotation axis to claim 6, distance and different between the second diffused light emitting portion and the second rotary shaft The light source device as described in the above. The light source device according to claim 2, wherein the first homogenizer optical system and the second homogenizer optical system each include a pair of lens arrays. The first condensing optical system and the second condensing optical system have the same configuration,
The light source device according to claim 2, wherein the third condensing optical system and the fourth condensing optical system have the same configuration. The light source device according to any one of claims 1 to 9, wherein the first lens integrator optical system and the second lens integrator optical system each include a pair of lens arrays. A first light source device and a second light source device,
The first light source device and the second light source device are each configured by the light source device according to any one of claims 1 to 10 ,
The light source unit, wherein the superimposing lens in the first light source device and the superimposing lens in the second light source device are formed of one lens member. An illumination device having a light source unit according to the light source apparatus or claim 1 1 according to any one of claims 1 1 0,
A light modulator that modulates light emitted from the illumination device according to image information to form image light;
And a projection optical system for projecting the image light.

Images